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Forum: C3 Tech/Performance
10-10-2006, 09:30 AM
Replies: 3
Views: 5,265
Posted By RDave

Hi Jim, I saw an old Hot Rod test where they...

Hi Jim,

I saw an old Hot Rod test where they dyno'ed a Mark IV LS6 Crate engine and got 437 HP.

I was still curious at what GM rated the torque for this engine at, with the 1970 Chevelle LS6...
Forum: C3 Tech/Performance
10-10-2006, 05:29 AM
Replies: 3
Views: 5,265
Posted By RDave

The Specs were the same as the 1970 LS6 Chevelle..

A friend emailed me this:

Engine part # 366250
Stamped XAA above timing chain cover

Displacement 454
HP 450@ 5600rpms
CR 10.2:1
Bore and stroke 4.25 x 4.00
cam shaft solid lifter flat...
Forum: C3 Tech/Performance
10-09-2006, 05:22 AM
Replies: 3
Views: 5,265
Posted By RDave

Hp and torque ratings of Mk IV Ls6 crate?

I wondered if anyone had the specs for the above crate engine which had a compression ratio of 10.2:1 which was in between the 1970 Chevelle LS6's 11:1 and the 1971 Corvette LS6's 9:1.

I found...
Forum: C3 Tech/Performance
09-09-2006, 02:06 PM
Replies: 32
Views: 24,297
Posted By RDave

Sounds like it would make the most sense to build it myself

Summitracing.com sells a bare 454 block that takes a mechanical fuel pump for $1200. I could get an aftermarket crank, rods and pistons.

From what I have been reading, the oval port heads are...
Forum: C3 Tech/Performance
09-03-2006, 06:52 PM
Replies: 32
Views: 24,297
Posted By RDave

454 HO specs:

454 HO ENGINE ASSEMBLY SPECIFICATIONS
Part Number: Old P/N 24502618, Current P/N 12568774
Displacement: 454 cubic inches (7.4-liter)
Horsepower: 425 @ 5,250 RPM
Torque: 500 @ 3,250 RPM ...
Forum: Engine Mods
09-03-2006, 04:27 PM
Replies: 2
Views: 8,731
Posted By RDave

454 H.O, 454cid /425HP Crate Engine = 1971 Corvette LS6?

This is my first post in the engine mods forum.

I wondered if this engine would be equal in performance to the
1971 Corvette LS6? :
...
Forum: C3 Tech/Performance
09-03-2006, 11:59 AM
Replies: 32
Views: 24,297
Posted By RDave

454 H.O, 454cid /425HP Crate Engine = 1971 Corvette LS6?

wfo76,

thanks for posting the numbers! One of these big blocks came new with an interior sticker that instructed the driver to turn the A/C off above a certain RPM.

I wondered if this engine...
Forum: C3 Tech/Performance
09-02-2006, 03:25 PM
Replies: 32
Views: 24,297
Posted By RDave

Dave is this a car your buying or selling ? Neither

I just used the photo from the auction. I am interested in building an LS6 replica motor and putting it in a C3, preferably a 1971 LS5 with air. power steering and power brakes. Through my post I...
Forum: C3 Tech/Performance
09-02-2006, 10:55 AM
Replies: 32
Views: 24,297
Posted By RDave

the velles aluminum high GM highrise!

I found this on the web:

LS-6 1970 454/450 HP Chevelle, 4-bolt block, steel "Tuftride" crank, 7/16" "dot" rods, forged pressed pin pistons, closed chamber square port heads, 11.0:1 comp, solid...
Forum: C3 Tech/Performance
09-02-2006, 10:36 AM
Replies: 32
Views: 24,297
Posted By RDave

1971 Ls-6 tach redline photo

Hi dwncchs,

the photo is from this Ebay auction:
...
Forum: C3 Tech/Performance
09-02-2006, 09:04 AM
Replies: 32
Views: 24,297
Posted By RDave

SAE rated HP @ given rpm vs maximum recommended engine speed

Hi dwncchs,

the 1971 LS6 was rated 425 HP @5600 rpm, but I was referring to the latter which indicated on the Ls6's tachometer:
...
Forum: C3 Tech/Performance
09-02-2006, 07:55 AM
Replies: 32
Views: 24,297
Posted By RDave

Differences between '70 Chevelle LS6 and the '71 Corvette LS6?

This is my first post. I was wondering exactly how the '70 Chevelle LS6 was modified to create the '71 Corvette LS6? There seems to be a lot of misinformation on the web and in print about this. ...
Showing results 1 to 12 of 12


 
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